我正在尝试将glsurfaceview作为我布局的一部分。它在我确定的一行返回错误，我不明白为什么。 我的GLGame课程：
public abstract class GLGame extends Activity implements Game, Renderer {
enum GLGameState {
Initialized,
Running,
Paused,
Finished,
Idle
}
GLSurfaceView glView;
GLGraphics glGraphics;
Audio audio;
Input input;
FileIO fileIO;
Screen screen;
GLGameState state = GLGameState.Initialized;
Object stateChanged = new Object();
long startTime = System.nanoTime();
WakeLock wakeLock;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
glView =(GLSurfaceView) this.findViewById (R.id.glSurface);
glView.setRenderer(this); //Failing line
setContentView(R.layout.main);
glGraphics = new GLGraphics(glView);
fileIO = new AndroidFileIO(getAssets());
audio = new AndroidAudio(this);
input = new AndroidInput(this, glView, 1, 1);
PowerManager powerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
wakeLock = powerManager.newWakeLock(PowerManager.FULL_WAKE_LOCK, "GLGame");
}
public void onResume() {
super.onResume();
glView.onResume();
wakeLock.acquire();
}
@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
glGraphics.setGL(gl);
synchronized(stateChanged) {
if(state == GLGameState.Initialized)
screen = getStartScreen();
state = GLGameState.Running;
screen.resume();
startTime = System.nanoTime();
}
}
@Override
public void onSurfaceChanged(GL10 gl, int width, int height) {
}
@Override
public void onDrawFrame(GL10 gl) {
GLGameState state = null;
synchronized(stateChanged) {
state = this.state;
}
if(state == GLGameState.Running) {
float deltaTime = (System.nanoTime()-startTime) / 1000000000.0f;
startTime = System.nanoTime();
screen.update(deltaTime);
screen.present(deltaTime);
}
if(state == GLGameState.Paused) {
screen.pause();
synchronized(stateChanged) {
this.state = GLGameState.Idle;
stateChanged.notifyAll();
}
}
if(state == GLGameState.Finished) {
screen.pause();
screen.dispose();
synchronized(stateChanged) {
this.state = GLGameState.Idle;
stateChanged.notifyAll();
}
}
}
@Override
public void onPause() {
synchronized(stateChanged) {
if(isFinishing())
state = GLGameState.Finished;
else
state = GLGameState.Paused;
while(true) {
try {
stateChanged.wait();
break;
} catch(InterruptedException e) {
}
}
}
wakeLock.release();
glView.onPause();
super.onPause();
}
public GLGraphics getGLGraphics() {
return glGraphics;
}
@Override
public Input getInput() {
return input;
}
@Override
public FileIO getFileIO() {
return fileIO;
}
@Override
public Graphics getGraphics() {
throw new IllegalStateException("We are using OpenGL!");
}
@Override
public Audio getAudio() {
return audio;
}
@Override
public void setScreen(Screen screen) {
if (screen == null)
throw new IllegalArgumentException("Screen must not be null");
this.screen.pause();
this.screen.dispose();
screen.resume();
screen.update(0);
this.screen = screen;
}
@Override
public Screen getCurrentScreen() {
return screen;
}
}
logcat的：
03-25 16:44:51.683 4919-4919/com.badlogic.androidgames.glbasics E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.badlogic.androidgames.glbasics, PID: 4919
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.badlogic.androidgames.glbasics/com.badlogic.androidgames.glbasics.GLGameTest}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.opengl.GLSurfaceView.setRenderer(android.opengl.GLSurfaceView$Renderer)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2329)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2391)
at android.app.ActivityThread.access$900(ActivityThread.java:147)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1296)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5256)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:898)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.opengl.GLSurfaceView.setRenderer(android.opengl.GLSurfaceView$Renderer)' on a null object reference
at com.badlogic.androidgames.framework.impl.GLGame.onCreate(GLGame.java:51)
at android.app.Activity.performCreate(Activity.java:5933)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2282)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2391)
at android.app.ActivityThread.access$900(ActivityThread.java:147)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1296)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5256)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:898)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
一切正常，直到我决定除了glsurfaceview之外我还想要其他东西。
我想我只是犯了一个愚蠢的错误，但是自从时间紧迫以后，如果你帮忙，我会很高兴。
由于
编辑：问题原因是我出于某种原因无法从这里找到viewview。我也试过这个：
GLGame.glView = (GLSurfaceView) ((Activity)getApplicationContext()).findViewById (R.id.glSurface);
答案 0 :(得分：2)
事实证明，以错误的顺序写作，我感到非常愚蠢。它应该是这样的：
setContentView(R.layout.main);
GLGame.glView = (GLSurfaceView) this.findViewById(R.id.glSurface);
glView.setRenderer(this);